upas

The English word “upas” has 3 meanings listed here.

noun

A tree, Antiaris toxicaria, of the mulberry family, common in the forests of Java and the neighboring islands, with poisonous secretions.
A virulent poison used in Java and the adjacent islands for poisoning arrows and derived from the tree.
A poison prepared from the climbing plant Strychnos tieute.

Borrowed from Malay upas.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.